Jeroen Bach

As a freelance engineering lead I've led teams and delivered full-stack solutions for both public and private sector clients, combining technical leadership with hands-on engineering. Highlights include:

• Led the development of a secure data management portal for cross-border criminal investigations at a large European institution, integrating investigations, biometrics, and photo/video data across a distributed event-driven architecture on Kubernetes in a private cloud.
• Introduced context/presentational component architecture, Storybook, and frontend unit testing with coverage, reducing pre-release QA defects from 3.5 to 0.6 per story point and shifting remaining issues from complex logic failures to trivial fixes.
• Designed and built a schema-driven Vue Dynamic Form library that is now adopted across multiple frontend projects, reducing form development from 8-13 story points to 2-3. Published it as open source at vue-dynamic-form.bach.software.
• Took on technical leadership within teams, mentoring colleagues and raising the overall frontend quality standard.
• Led a case management project enabling crime analysts to group and jointly manage multiple member state cases as one, with cross-team collaboration, role-based permissions, and linked contributions.
• Led architecture and delivery of three Vue.js webshops for retail clients with a team of 4 developers, creating a common server-side rendering framework reused across all three projects.
• Led a team of 8 engineers to deliver a React-based webshop for SMB customers on Salesforce. Kept the team engaged and motivated through the organisational uncertainty of a merger by tackling problems collaboratively and delegating meaningful responsibility, so everyone continued learning and growing regardless of the outcome.

Co-founded a luxury women's fashion brand, owning the full scope from technical architecture and IT infrastructure to brand identity and customer acquisition. Operating across all functions in a small founding team was a formative experience in end-to-end ownership and decision-making. Key contributions:

• Created a performant and secure Prestashop-based e-commerce site.
• Set up and managed the complete IT infrastructure, including scalable hosting on Azure Kubernetes Service and Cloudflare Workers, CI/CD pipelines, and performance testing.

Led a 12-person team of engineers and contractors, owning the full people management cycle: hiring, performance reviews, and individual development. Key contributions:

• Delegated meaningful ownership across contractor sourcing, functional requirements, project management, and code quality based on individual strengths, growing team capability and engagement.
• Managed underperformance through direct, structured feedback conversations and aligned individual development goals with team and organisational objectives.
• Delivered the Customer Management Portal: a React.js / ASP.NET Web API integration with SAP, managing customer onboarding workflows including credit checks and background checks.
• Participated in PVH's Franklin Covey leadership programme.

Delivered a variety of employee portals and internal applications within the Microsoft Development team, progressing from senior developer towards the team lead role. Projects included:

• SAP Customer Setup, Chargebacks, Trade Discount, and Store Master Data management portals.

Worked across the full stack using .NET Forms & MVC, C#, JavaScript (with jQuery, React.js, Knockout.js), and SharePoint. Built workflows with NINTEX, and handled data flows with SQL Server and SQL Server Integration Services (SSIS).

Consultant across multiple enterprise clients in financial services and the public sector, including insurance, banking, music licensing, and government. Key projects included:

• Achmea - Portal Factory: Led one of two Avanade scrum teams as Team Lead and Solution Architect, building a reusable component and portal factory that reduced brand portal delivery time from years to months. Designed and implemented components using C#, .NET, and WCF integrated via SOAP services.

• BUMA/STEMRA - Customer Portal: Built a data-rich portal allowing music rights holders to manage licenses and usage information. Used ASP.NET Ajax, jQuery, and WCF to integrate with ERP and data warehouse systems.

• KIWA / AFM / Friesland Bank / Centraal Beheer / ING / PWN: Developed portals using ASP.NET, SharePoint, BizTalk, WCF, CRM, and front-end tech (HTML, CSS, JavaScript/jQuery) to automate product ordering and customer workflows.

Projects spanned the full stack, often integrating complex backend systems with responsive, user-focused front ends.

Co-founded Eludus with two friends as a side project, originally intended to build a tournament platform. The company evolved into a small digital agency delivering websites, webshops, and custom backend systems for SMEs.